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Can SIP be used for Internet telephony gateways (ITGs)?

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Can SIP be used for Internet telephony gateways (ITGs)?

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Yes, in two ways. First, it can indicate to the Internet-based caller that the callee is reachable via an ITG, via the Contact header. Secondly, two ITGs connecting parties on the PSTN can signal new calls to each other, with the destination phone number contained in the request URL.

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